There's a friend of mine who sits next to me in stuff loads of lessons, always copies my work and asks me for answers and never does his own work.
If you remove your work from his area, he follows you and physically removes it form you to copy.
He then insists that he is perfectly intelligent when he can't do any of the work himself, and gets confused on multiple choice "fill in the blanks" questions in our workbooks, which aren't just easy, they actually only make sense in one way and take the smallest bit of commong sense.
Unfortunately, he is much much bigger than me, and could probably squash me with his size, so I can't exactly fight him off for my work, which appears to be the only form of communication which truly gets through to him.
He is also the biggest boast to being able to do well in exams, kinda, because he spends the whole day before the exam revising/learning things and just temporarily memorising them.
And he likes to boast about how he is going to a very good college.
The actual college is just as good as any others in the area, but he insists this is better than the one myself and many others will go to.
The thing is, me and my friends all have to reach certain grades to get into our college and for them to accept us.
His is a private college, and his parents will just pay for him to go in. He actually doesn't have any minimum requirements for grades at all.
tl;dr
The stuff that gets me mad is my copying, boasting, obnoxious friend who lazes/buys his way through everything.